Heat responsive means for controlling the air supply to liquid fuel burners



June 6, 1944. s. PERRY 2,350,920

HEAT RESPONSIVE MEANS FOR vCONTROLLING THE AIR SUPPLY TO LIQUID FUEL BURNERS Filed Jan. 22, 1941 2 Sheets-Sheet l June 6, 1944. s PERRY 1 2,350,920

HEAT RESPONSIVEMEANS FOR CONTROLLING THE AIR SUPPLY TO LIQUID FUEL BURNERS Filed Jan. 22, 1941 2 Sheets-Sheet 2 f7? V67? for L 522x72 Zqy Perry Patented June 6, 1944 HEAT nnsroivsrvn MEANS FOR CONTROL- LING THE AIR, SUPPLY T 0 LIQUID FuEL BURNERS Stanley Perry,-.0hicago, 'Ill., assignor to Oil Devices, Santa Fe, N. Mex., a limited partnership of Illinois Application January 22, 1941. Serial No. 375,468

Claims. (01. 158-91) .My invention relates to animprovement in burners and has for one purpose the provision .of

a burner, for example a liquidrfuel burner, in which the air pressure surrounding the burner may be controlled or varied in response to changes in temperature at or adjacent the burner itself.

Another purpose .is the provision of means: for varying the delivery of air-about a burner from a motor driven fan and the cross sectional area of the delivery opening from the fan in response to heatchanges at orabout the burner. It may be advantageous to control the air supply in response to heat conditions at or near the bottom of the pot, but under some circumstances it may also ,be advantageous to control it in response to temperature conditions elsewhere in. on .or near' the pot.

Another purpose is to provide for the delivery of air to the oil pilot of anoil burningYbumer.

Another purpose is to provide for deliveryof air under difi'e'rent pressures but from acommon source about a p01; typ burner d t0 pilot inletof such pot type burner.

Other purposes will appear from time to time in the course of the specification and claims.

I illustrate my invention more or less diagrammatically in the accompanying drawings wherein: V

Fig. 1 isa vertical axial section; 7

Fig.2 is a section on the line .22 ofFig. 1;

Fig. 3 is adetail; and

Fig. 4 is an enlarged section on the line ,4.l of Fig. 2, with the parts in a different position.

Like parts are indicated by like symbols throughout the specification and drawings.

Referring to the drawings, I may employ an outer shell or drum I, having any suitable air inlet means or apertures 2 to admit air to a lower portion thereof. Mounted within the drum l is a pot 3 having a .plurality of primary air inlet apertures 4, located at various levels, and in the particular embodiment shown, a row of secondary air inlet apertures 5. The pot may be mounted for example .upon any suitable ring 6 and 1 indicates a fire .ring with a central aperture-8. 1 j I Sis a generally horizontal partition located below the pot and shown as having a generally central offset portion [0. with an aperture .l.| therein. The offset portion may be formed as a typical fan scroll, as shown in Fig. .2, terminating at one side in a tangential air discharge nozzle l2, which in turn delivers air along a duct 13. having a portion l4, preferably in fairly close proximity to the exterior. of the pot. It may then be recurved downwardly, as at 15, to a .;fuel inlet nozzle generally indicated at Hi. The airdelive'red along the duct l3 maythenbe mixedWiththeiin flowing fuel orvapor therefrom; whichfl'ows inwardly along the passage l1 of the nozzleli.

I8 indicates a line extending fromany suitable source of fuel supply not hereinshown'. The top of the air delivery passag shouldbe'locatedabove the lowest row of primary air holes 4, and there fore above any possiblefuel level.- l9=is a vent in an upper portion of the duct, whicha'prevent's any possible siphoning'actionin the eventof fiooding. 2| is any suitable motor, which'may for example be suspended from the bottom of theoifset' or scroll portion ID by any suitable connections .22.

It serves to actuate a fan shaft 25:',.liaving a hub 24 with fan blades 25. 26 is a plate or air control member located above the fan, herein shown as having a diameter somewhat less than thecircular opening 21, which closes the top of the above described scroll structure. It will be understood, however, that it may be of larger diameterif desired, the essential point being that the' plate 26 shall constitutea removable orflow control member. The space between it andthe adjacent portion of the partition'fl servesp asan airgatethe cross sectional area of which may be-y ri the employment of bimetallic strips or warping bars or other heat responsive means 28 ,as supports for the plate 25. Iillustratea simple and convenient arrangement in whichtheplurality of warping bars 28 serve both as actuating means and as supportsfor the plate 26.

' It will be understood, however,.thatI-rnayv em ploya wide variety 01' mechanisms, :the essential p int being that the plate .28 or its equivalent is moved in response to heat conditions in, at or .near the pot in order to .vary'the outlet passage between the plate 26 and adjacentportions of the partition 19. It maybe desirable ,to increase ,the clearance in response to an increasei'n heat, or to decrease the clearance in response to an increase in heat, a d either purpose may be simply and efficientlyobtaind by the structurehereinshown ,orby modifications thereof. A simpletapplication of mytinventiomas shownin Fig.1, is -to,have,-the warping bars so formed as to-lifttheplate .26 in response .to the increase of .heat inthe ,pOt. But

this is merely. one embodiment of my invention;

It-,will beobserved that theair is delivered at higher pressure to the pilotduct ll than it is to the space aboutthe pot, sincethepilotductjs in communication with the tangential discharge nozzle {2. It is important that the pilot duct ,be not large .enough to take the entire outputof I than the pressure about the pot.

or diagrammatic, rather fuel housing. j

' said casing-said fan 2 the fan. It is also important that the lower inlet I l to the scroll Ill be of less diameter than the aperture through which air, is discharged to the space about the pot.

'In the operation of my invention Iprovide a lesser volume of. airto the pilot at a a relatively high pressure, anda larger volume of air to the space about the pot at a relatively low pressurethatiis to say,more air is supplied to the pot than to the pilot, but the pressure to the pilot i higher In'the particular form herein passage l3, l4 extends sufllciently closely to the outer face of the pot 3 to provide a pro-heating of the air delivered to the pilot, which may be useful to assist or increase the vaporization rate of the fuelinwardly supplied along the fuel inlet nozzle l5, and may also increase the velocity of have shown the passage ,7

housing, and an air delivery duct extending from the fair housing to the fuel duct and in communication with the interior of the fuel duct at a point spaced outwardly away from the fuel delivery end of the duct, and means for varying the effective opening between the fanhousing and the space about the pot, including a closure element aligned with said aperture, and means responsive to changes in temperatures for movshown the air :rality of air inletapertures, a 16 equivalent'todeliver air directly to the pot or to a J deliver air both, directly to the pot and to the Iclaimx I q 1. In combination, a burner pot having a plurality ot'air inlet apertures, a fuel duct extending to the pot, a housing surrounding the pot,'afan casing-having an air 'ln'lt aperture, a fan in casing having a peripheral discharge aperture, and an axial discharge 'aper- 'ture,,the latter'communicating with the space about said pot, an air delivery passage extending from'said peripheral aperture .to the interior of the fuel duct, the :fan having an air delivery capacitygreater than the {capacity ofatheperipheral aperture, the aperture in'the fan casing-in I communication, with the space about the pot being of greater diameter than the air inlet of the "fan casing. m 4

2. In combination, a'burnerpot having a plu- 2 ralityof air inlet apertures in itswall, a housing surrounding said pot, .a fuel duct extending to the pot, a motor, a fandriven by said motor,

and a fan housing for said fan, said housing having an air inletaperture adaptedto receive outside air and an air deliveringv aperture adapted to deliver air to the space between the pot and the housing'a'nd in line with the bottom of the pot, and an air delivery duct extending from the fan housing to the fuelduct and in communica tionwith the interior of the fuel ductat a point spaced outwardly away from 'the fuel delivery end oftheduct. i

3. In combination, a burner pot having a pluralityof air inlet apertures in its wall, a housing surrounding said pot, a fuelduct extendin to the pot, amotor, a fan driven by said motor,

and a fan housing for said fan, said housing having an: air inlet aperture adapted to receive outside air and an air delivering aperture adapted to deliver air to the space between the pot and the interior of the ing said element toward and away from maxi mum closing position in response to changes in temperature of thespace adjacent the pot.

4. In combination, a burner pot having a plufuel duct extending to the pot, a housing surrounding said pot, a fan, adapted to deliver air to the space about the pot, means for delivering air from the fan to the fuel duct at higher pressure and in smaller volume than the pressure and volume of the air delivered from the fan to the space ,about the pot, and means for varying the rate of flow of air from the fan into the interior of said housing in response to variations of temperature adjacent the'burner.

5. In combination, a burner 'pot having a pluralityiof'air inlet apertures, a fuel duct extendlngto' thepot, a housing surrounding said pot, to'the space about from the fan sure and in smaller volume than the pressure and volume of the air delivered from the fan to thespace about the pot, and means for varying the rate of flow of air from the ran into the interior of said housing in response to variations of temperature adjacent the burner, including shutter means movably positioned between the fan and the pot. f g

6. In combination-a burner pot having a plurality of air inlet apertures, a 'fuel duct extending to the pot a; housing surrounding said pot, a

fan, adadapted'to deliver air to the space about the pot, means for delivering air from the fan to the interior of thefuel duct at higher pressure and in smaller volume'than the pressure and volume of the air delivered from the fan to the space about the pot, and means for varying the rate offlow of air from the fan into the, interior of said housing in response to variations of temperature adjacent the burner including shutter means positioned between the fan and the pot and heat responsive means for moving said shut- 'ter means.v r v '7. In combination, a burner pot having a plurality of air inlet apertures, a fue1 duct extending to the pot, a housing surrounding said pot,

a fan adapted to deliver air to the space about rate of flow ofair from thefan into the interior or said housing in response to variations of temperature adjacent the burner, including shutter means between the fan and the pot, and a warping bar, subjected tothe heat of the pot, in actuating relationship with the shutter means.

8. In combination, a burner pot having a bottom and a' generally cylindrical side wall with a plurality of air inlet apertures through said side wall, a fuel duct extending to the pot,

"an outer housing surrounding said pot, a fan positioned generally co-axially with the pot and adapted to deliver air to the interior ofthe outer housing and toward the bottom of the pot, a fan housing for said fan and an air duct extending from a peripheral portion of the fan housing to the interior of the fuel duct.

'9. In combination, a burner pot having a bottom and a generally cylindrical side wall with a plurality of air inlet apertures through said side wall, a fuel duct extending to'the pot, an outer housing surrounding said pot, a fan positioned generally co-axially with thev pot and adapted to deliver air to the interior of the outer housing and toward the bottom of the pot, a fan housing for said fan and an air duct extending from a peripheral portion of the fan housing to the interior of the fuel duct and means for varying the rate of air flow from the fan housing to the interior of said outer housing in response to variations of temperature adjacent the pot.

10. In combination, a burner pot having a bottom and a generally cylindrica1 side wall with a plurality'of air inlet apertures through said side wall, a fuel duct extending to the pot, an outer housing surrounding said pot, a fan positioned generally coaxially with the pot and adapted to deliver air to the interior of the outer housing and toward the bottom of the pot, a fan housing for said fan and an air duct extending from a peripheral portion of the fan housing to the interior of the fuel duct, said outer housing having a wall with an aperture aligned between said fan and pot and means for varying the rate of air flow from the fan housing through said aperture to the interior of the outer housing in response to variations of temperature adjacent said pot, including shutter means associated with said aperture and means for actuating said shutter means in response to changes in temperature conditions adjacent said pot.

STANLEY PERRY. 

